Gasified fuel burner for burning a liquid fuel and water in a gaseous mixture

ABSTRACT

A diffuser-vaporizer is rotatably mounted in a combustion cylinder and formed with an opening which is disposed in spaced juxtaposed relationship to an opening formed substantially in the central portion of a gas chamber defined in the combustion cylinder. There is formed, between the opening in the diffuservaporizer and the opening in the gas chamber, a fuel scattering clearance large enough for a liquid fuel to move therethrough and scatter in the combustion cylinder in atomized particles to sustain combustion of the liquid fuel. A frusto-conical blast supply member extends through the gas chamber into the diffuservaporizer to supply a stream of air under pressure to the diffuser-vaporizer and then to the gas chamber. A liquid fuel and water are supplied to the diffuser-vaporizer to vaporize quickly on the inner surface of the diffuser-vaporizer. A combustion plate is provided at the periphery of the gas chamber for ejecting therethrough a mixture of gasified fuel and steam together with the stream of air supplied under pressure through the blast supply member to carry out combustion of the gasified fuel. Water may be vaporized separately from the liquid fuel in a steam generating annular chamber provided at the end of a flame ejecting opening of the combustion cylinder. The superheated steam produced is supplied through a steam line to the diffuservaporizer where it is mixed with the gasified fuel together with the stream of air supplied under pressure. Means may be provided for converting the stream of air supplied under pressure through the blast supply member into a hot blast and mixing such hot blast with the mixture of gasified fuel and superheated steam to increase the degree of efficiency with which combustion of the gasified fuel is carried out.

United States Patent [191 Miyahara [451 Oct. 29, 1974 GASIFIED FUELBURNER FOR BURNING A LIQUID FUEL AND WATER IN A GASEOUS MIXTURE [75]Inventor: Kingo Miyahara, Tokyo, Japan [73] Assignee: Kabushiki KaishaDowa, Tokyo,

Japan [22] Filed: Oct. 29, 1973 [21] Appl. No.: 410,757

[30] Foreign Application Priority Data May 18, 1973 Japan 48-55335 June19, 1973 Japan 48-73292 June 19, 1973 Japan 48-73293 [52] US. Cl431/168, 239/21417, 239/214.25, 431/190, 431/210, 431/242 PrimaryExaminerEdward G. Favors Attorney, Agent, or Firm-Hill, Gross, Simpson,Van Santen, Steadman, Chiara & Simpson [5 7] ABSTRACT Adiffuser-vaporizer is rotatably mounted in a combustion cylinder andformed with an opening which is disposed in spaced juxtaposedrelationship to an opening formed substantially in the central portionof a gas chamber defined in the combustion cylinder. There is formed,between the opening in the diffuser-vaporizer and the opening in the gaschamber, a fuel scattering clearance large enough for a liquid fuel tomove therethrough and scatter in the combustion cylinder in atomizedparticles to sustain combustion of the liquid fuel. A frusto-conicalblast supply member extends through the gas chamber into thediffuser-vaporizer to supply a stream of air under pressure to thediffuservaporizer and then to the gas chamber. A liquid fuel and waterare supplied to the diffuser-vaporizer to vaporize quickly on the innersurface of the diffuservaporizer. A combustion plate is provided at theperiphery of the gas chamber for ejecting therethrough a mixture ofgasified fuel and steam together with the stream of air supplied underpressure through the blast supply member to carry out combustion of thegasified fuel.

Water may be vaporized separately from the liquid fuel in a steamgenerating annular chamber provided at the end of a flame ejectingopening of the combustion cylinder. The superheated steam produced issupplied through a steam line to the diffuser-vaporizer where it ismixed with the gasified fuel together with the stream of air suppliedunder pressure.

Means may be provided for converting the stream of air supplied underpressure through the blast supply member into a hot blast and mixingsuch hot blast with the mixture of gasified fuel and superheated steamto increase the degree of efficiency with which combustion of thegasified fuel is carried out.

3 Claims, 9 Drawing Figures PATENTEU 08] 29 I874 3.844.795 saw 10F 4 vFIG. I

sum 30F PAIENIEUnm 29 mm FIG. 5

GASIFIED FUEL BURNER FOR BURNING A LIQUID FUEL AND WATER IN A GASEOUSMIXTURE This invention relates to burners, and more particularly it isconcerned with a gasified fuel burner adapted to vaporize a liquid fueland water and cause a mixture of a gasified fuel and steam to burn ingaseous state.

The outstanding characteristic of the invention is that a liquid fuel,particularly kerosene, and water are vaporized by precombustion andheating of the fuel in liquid form to produce a gasified fuel andgenerate steam which gasified fuel and steam are thoroughly mixedtogether and ejected through a combustion plate as a mixture of gasifiedfuel and steam in atomized particules for combustion of the gasifiedfuel.

Heretofore, in gasified fuel burners of the prior art wherein a liquidfuel is vaporized and burned without producing noise and odor, thesupplied liquid fuel is vaporized in most cases by suitable means toproduce a gasified fuel which is mixed with a stream of air suppliedunder pressure before being ejected for combustion. Thus, although thegasified fuel burners of the type described offer an advantage in thatcombustion takes place quietly without producing noise as is the casewith burners adapted to burn a fuel in liquid state and withoutproducing odor, they do not lend themselves to economizing on fuelconsumption, with only 20 to 30 percent of the fuel being saved byvaporization combustion carried out by means of conventional gasifiedfuel burners as compared with the combustion of a fuel in liquid state.

Accordingly, a principal object of the invention is to provide agasified fuel burner wherein a liquid fuel and water are vaporized intogaseous state and mixed together while they vaporize, and a mixture of agasified fuel and steam thus produced is ejected for combustion with ahigh degree of efficiency so that fuel consumption can be greatlyreduced.

Another object of the invention is to provide a gasified fuel burnerwherein a liquid fuel is first burned in liquid state and the heatproduced by combustion of the fuel in liquid state is utilized forexpedition vaporization of the liquid fuel and water, and a mixture of agasified fuel and steam produced by the aforementioned precombustion andheating of the fuel in liquid state is further mixed with a stream ofair supplied under pressure before the mixture is automatically ejectedthrough the combustion plate for combustion.

A still another object of the invention is to provide a gasified fuelburner wherein there are separately provided a chamber in which a liquidfuel is converted into a gasified fuel by precombustion and heating ofthe liquid fuel in liquid state and a chamber in which water is heatedto generate superheated steam, with a gasified fuel and super heatedsteam being thoroughly mixed together and ejected through the combustionplate for combustion while the volume of the gases as a whole isincreased.

A further object of the invention is to provide a gasified fuel burnerwherein the superheated steam generated by the heat produced byprecombustion of the liquid fuel in liquid state is injected into a hotblast which is produced by heating a stream of air under pressure orblast by the heat produced by precombustion of the liquid fuel in liquidstate, whereby combustion of a gasified fuel can take placesatisfactorily with a high degree of efficiency.

According to the invention, there is provided a gasified fuel burnerwherein a diffuser-vaporizer is rotatably mounted in a combustioncylinder and formed with an opening which is disposed in spacedjuxtaposed relationship to an opening formed substantially in thecentral portion of the gas chamber, with a fuel scattering clearance ofa size large enough for the liquid fuel to move therethrough and scatterin the combustion cylinder in atomized particles being formed betweenthe opening in the gas chamber and the opening in the diffuser-vaporizerto sustain combustion of the fuel in liquid state; a frustoconical blastsupply member extends through the gas chamber into the diffuservaporizerto supply a stream of air under pressure to the diffuser-vaporizer andthen to the gas chamber; a liquid fuel supply line and a water supplyline opening on the inner surface of the diffuser-vaporizer to supplythe liquid fuel and water to obtain quick vaporization thereof; and acombustion plate is provided at the periphery of the gas chamber forejecting therethrough a mixture of a gasified fuel and steam togetherwith the stream of air supplied under pressure through the blast supplymember so as to effect combustion of the gasified fuel with a highdegree of efficiency.

According to the invention, there is provided in the gasified fuelburner of the type described, means for vaporizing the water separatelyfrom the liquid fuel comprising a steam generating annular chamberdisposed at the end of a flame ejecting opening of the combustioncylinder for obtaining quick vaporization of water to generatesuperheated steam by the heat produced by precombustion of the liquidfuel in liquid state on the inner surface of the diffuser-vaporizerwhile the liquid fuel is vaporized on the inner surface of thediffuservaporizer, and a steam line connected at one end to the steamgenerating annular chamber and an opening at the other end in thefrusto-conical blast supply member for introducing the superheated steamtherethrough into the diffuser-vaporizer together with the stream of airsupplied under pressure through the blast supply member.

According to the invention, there is also provided, in the gasified fuelburner of the type described, means for producing a hot blast by heatinga stream of air under pressure or blast by the heat produced byprecombustion of the fuel in liquid state, so that the superheated steamcan be injected into the hot blast to obtain improved mixing of not onlythe superheated steam and hot blast but also of the gasified fuel andsuperheated steam, such means comprising a hot blast producing annularchamber disposed outside the steam generating annular chamber, a blastduct connected at one end to the hot blast producing annular chamber tosupply a cool blast thereto, and a hot blast duct connected at one endto the hot blast producing annular chamber and opening at the other endin the blast supply member, with the steam line connected at one end tothe steam generating annular chamber and opening at the other end in thehot blast duct, whereby the superheated steam generated in the steamgenerating an nular chamber can be injected into a hot blast produced inthe hot blast producing annular chamber while the superheated steam ismixed with the gasified fuel produced on the inner surface of thediffuservaporizer to produce a mixture of gasified fuel and superheatedsteam for combustion through the combustion plate.

Additional and other objects and features of the invention will becomeevident from the description set forth hereinafter when considered inconjunction with the accompanying drawings, in which:

FIG. 1 and FIG. 2 illustrate an embodiment of the invention in which aliquid fuel and water are vaporized in the same vaporizing chamber, FIG.1 being a vertical sectional front view of the burner with certain partsbeing cut out and FIG. 2 being a side view thereof;

FIG. 3 to FIG. 6 illustrate another embodiment in which a liquid fueland water are vaporized in separate chambers into gaseous state andmixed together later for combustion, FIG. 3 being a vertical sectionalview of the burner with certain parts being cut out, FIG. 4 being asectional view taken along the line IVIV of FIG. 3, FIG. 5 being asectional view taken along the line VV of FIG. 3 and FIG. 6 being aperspective view of the frusto-conical blast supply member; and

FIG. 7 to FIG. 9 illustrate still another embodiment in which a streamof air supplied under pressure and mixed with a gasified fuel and steamis heated into a hot blast before being mixed therewith, FIG. 7 being avertical sectional front view of the burner with certain parts being cutout, FIG. 8 being a side view thereof and FIG. 9 being a sectional viewtaken along the line IX-IX of FIG. 7.

The construction of the gasified fuel burner in basic form according tothe invention shown in FIG. 1 and FIG. 2 will now be described. 1designates a combustion cylinder defining therein a gas chamber 2 havinga combustion plate 3 mounted at its periphery for ejecting a mixture ofgasified fuel and steam therethrough for combustion. An opening 4 isformed substantially in the central portion of the gas chamber. Adiffuservaporizer 5 formed with an opening 6 disposed in spacedjuxtaposed relationship to the opening 4 is mounted in combustioncylinder 1 and supported for rotation by a shaft 7 extending through thegas chamber 2 and its opening 4. A fuel scattering clearance 8 is formedbetween the opening in the diffusionvaporizer 5 and the opening 4 in thegas chamber 2.

The diffuser-vaporizer 5 may be provided on its inner surface with arough material layer by mounting thereon a wire netting 9 for promotingdiffusion and vaporization of the liquid fuel. Alternatively, the wirenetting 9 may be done without and a smooth material layer may beprovided instead.

10 designates a frusto-conical blast supply member coaxial with therotary shaft 7 and extending through the gas chamber 2 into thediffuser-vaporizer 5 to supply a stream of air under pressure to thediffuservaporizer 5 and then to the gas chamber 2. I1 is a fuel supplyline for supplying a liquid fuel to the inner surface of thediffuscrvaporizer 5 while 12 is water supply line for supplying water tothe inner surface of the diffuser-vaporizer 5. The fuel supply line 11and the water supply line 12 open in the vicinity of diffuser elementsI3 and 14 respectively which are separately connected to the rotaryshaft 7 for supplying a liquid fuel and water to the inner surface ofthe diffuser-vaporizer 5. Alternatively, the fuel supply line 11 and thewater supply line 12 may be made to open in the vicinity of one diffuserelement 13, in place of two diffuser elements l3 and 14 respectively,for supplying a liquid fuel and water to the inner surface of thediffuservaporizer 5. 15 is an ignition plug.

In operation, the rotary shaft 7 is rotated to operate thediffuser-vaporizer 5 and at the same time a stream of air is suppliedunder pressure through the frustoconical blast supply member 10 to theinner surface of the duffuser-vaporizer 5. Then, a liquid fuel issupplied to the surface of the diffuser element 13 which is rotatingwith the rotary shaft 7. The supply of liquid fuel delivered to thediffuser elements 13 moves to the inner surface of thediffuser-vaporizer 5 while spreading in all directions. The liquid fuelmoves and spreads quickly and uniformly by virtue of centrifugal forcesexerted on the rotating diffuser-vaporizer 5 and the action of thestream of air supplied under pressure to the diffuservaporizer 5 throughthe frusto-conical blast supply member 10. Thus, the liquid fuel mixeswith a portion of the air stream and scatters in atomized particlesthrough the fuel scattering clearance 8, into the combustion cylinder 1where combustion of the liquid fuel in liquid state is initiated when itis ignited.

As combustion of the liquid fuel is started as a preliminary combustionstep, the rotating diffuservaporizer 5 is heated at once, so that theliquid fuel supplied to its inner surface through the fuel supply lineII is vaporized into a gasified fuel while quickly moving and scatteringalong the diffuser-vaporizer 5 which gasified fuel is supplied, togetherwith the stream of air supplied under pressure through thefrusto-conical blast supply member 10, to the gas chamber 2 where theyare mixed together and the mixture is ejected through the combustionplate 3 for combustion.

When combustion of gasified liquid is initiated as aforementioned, wateris supplied through the water supply line 12 and the rotating diffuserelement 14 and sprinkled on to the surface of the diffuser-vaporizer 5.The water is vaporized and expands to generate steam while it moves andspreads quickly on the diffuservaporizer 5 by virtue of heating ofdiffuser-vaporizer 5, centrifugal forces exerted on the rotatingdiffuservaporizer 5 and the action of the stream of air supplied underpressure through the frusto-conical blast supply member 10. Thus, thediffuser-vaporizer 5 simultaneously performs the functions of producinga gasified fuel and generating steam, and the gasified fuel and steamproduced in this way are mixed together. The mixture is thoroughly mixedwith the stream of air while the former is introduced under pressureinto the gas chamber 2 by the latter, and the mixture of gasified fuel,steam and air is ejected through the combustion plate 3 for combustion.Flames produced when such mixture of gasified fuel, steam and air isburned have a high temperature because the mixture contains moisture.

FIG. 3 to FIG. 6 illustrate a second embodiment of the invention whichrepresents a modification of the aforementioned basic form of the burneraccording to the invention. As shown, the burner further comprises asteam generating annular chamber 16 disposed at the periphery of a flameejection opening 17, and a steam line 18 connected at one end to thesteam generating annular chamber 16 and opening at the other end in thefrusto-conical blast supply member 10. By this means, the liquid fuel isconverted into a gasified fuel by the rotating diffuser-vaporizer 5while the water is quickly heated and generates superheated steam in thesteam generating annular chamber 16 as it is heated by the heat producedby precombustion of the liquid fuel in liquid state, with thesuperheated steam being ejected into the blast supply member throughwhich the stream of air moves under pressure. Thus, the arrange ment iseffective to obtain a better mixing of the gasified fuel with thesuperheated steam so that combustion of the gasified fuel can be carriedout more satisfactorily than in conventional gasified fuel burners.

The steam generating annular chamber 16 is coated on its inner surfacewith a moisture-containing material layer 19 for converting water intosteam as quickly as possible by precombustion and heating of the liquidfuel in liquid state on the diffuser-vaporizer 5. Water is suppliedthrough a water supply line 20 opening at one end in the steamgenerating annular chamber 16. In the second embodiment shown anddescribed above, a suitable number of rotary guide vanes 21 best seen inFIG. 6 may be provided at the forward end of the frusto-conical blastsupply member 10 to cause the stream of air supplied under pressurethrough the blast supply member 10 to be ejected in a direction oppositeto the direction of rotation of the diffuser-vaporizer 5 so as tothereby promote diffusion, scattering and vaporization of the liquidfuel.

Characteristic of the second embodiment described above is that theliquid fuel and water are vaporized separately in the diffuser-vaporizer5 and steam generating annular chamber 16 respectively. This arrangementpermits vaporization and combustion of not only a small volume of fueland water but also a large volume thereof to be carried out any time asdesired. Besides, the steam generated in this way is a superheated steamwhich is capable of attaining better mixing with gasified fuel to enablevaporization and combustion of liquid fuel to be carried out with ahigher degree of efficiency.

FIG. 7 to FIG. 8 illustrate a third embodiment which represents amodification of the second embodiment. As shown, the third embodiment ofthe invention further comprises means for converting the stream of airsupplied under pressure through the frusto-conical blast supply memberinto a hot blast before producing a mixture thereof with the mixture ofgasified fuel and superheates steam. More specifically, such meanscomprises a hot blast producing annular chamber 22 disposed directlyoutside the steam generating annular chamber l6 described with referenceto the second embodiment, a blast duct 23 connected at one end to thehot blast producing annular chamber 22 to supply a cool blast to theinterior of the hot blast producing annular chamber 22, and a hot blastduct 24 connected at one end to the hot blast producing annular chamber22 and opening at the other end in the interior of the blast supplymember 10. The steam line 18 connected at one end to the steamgenerating annular chamber 16 opens at the other end in-the interior ofthe hot blast duct so as to thoroughly mix superheated steam with hotblast and injecting the mixture into the diffuservaporizer 5 togetherwith the stream of air supplied under pressure through thefrusto-conical air blast member 10 thereby attaining better mixing ofthe gasified fuel with the superheated steam and increasing the volumeof gases. Thus, combustion of the gasified liquid fuel can be carriedout satisfactorily.

From the foregoing description, it will be appreciated that according tothe invention, the rotating diffuservaporizer 5 is quickly heated byprecombustion of the liquid fuel in liquid state, and not only theliquid fuel supplied to the diffuser-vaporizer 5 thereafter but also thewater supplied thereto is vaporized simultaneously. The gasified fueland steam produced in this way are mixed together with a stream of airsupplied under pressure through the blast supply member to produce aperfect mixture of gasified fuel, steam and air for combustion. Theinvention offers the advantages of permitting to greatly economize onfuel, increasing the volume of gases to sustain combustion at elevatedtemperatures over a prolonged period, and producing flames whichcontains mixture because of mixing of fuel with steam to therebynaturalize noxious components of gases. Thus, the gasified fuel burneraccording to the invention is devoid of the danger of emitting noxiousgases and highly efficient in operation.

While the invention has been shown and described with reference to someembodiments thereof, it is to be understood that the invention is notlimited to the specific forms of the embodiments and that many changesand modifications may be made therein without departing from the spiritand scope of the invention.

What I claim is:

l. A gasified fuel burner adapted to convert a liquid fuel and waterinto a mixture of a gasified fuel and steam for combustion of the fuelin gasified state, comprising a combustion cylinder, a gas chamberdefined in said combustion cylinder and formed with an openingsubstantially in its central portion, a diffuservaporizer rotatablymounted in said combustion cylinderand formed with an opening disposedin spaced juxtaposed relationship to said opening in said gas chamber,with a fuel scattering clearance of a size large enough for the liquidfuel to move therethrough and scatter in the combustion cylinder inatomized particles formed between the opening in the diffuser-vaporizerand the opening in the gas chamber to sustain combustion of the liquidfuel, a frusto-conical blast supply member extending through the gaschamber into the diffuser-vaporizer to supply a stream of air underpressure to the diffuser-vaporizer and then to the gas chamber, a steamgenerating annular chamber provided at the end of a flame ejectingopening of the combustion cylinder for heating supplied water by theheat produced by combustion of the fuel in liquid state and generatingsuperheated steam therein, a steam line connected at one end to saidsteam generating annular chamber and opening at the other end in saidfrustoconical blast supply member so that the superheated steam producedin said steam generating annular chamber is mixed with the gasified fuelproduced in said diffuser-vaporizer together with the stream of airsupplied under pressure through the blast supply member, and acombustion plate provided at the periphery of the gas chamber forejecting therethrough a mixture of gasified fuel and superheated steamtogether with the stream of air supplied under pressure through theblast supply member whereby combustion of the gasified fuel can becarried out satisfactorily.

2. A gasified fuel burner adapted to convert a liquid fuel and waterinto a mixture of a gasified fuel and steam for combustion of the fuelin gasified state, comprising a combustion cylinder, a gas chamberdefined in said combustion cylinder and formed with an openingsubstantially in its central portion, a diffuservaporizer rotatablymounted in said combustion cylinder and formed with an opening disposedin spaced juxtaposed relationship to said opening in said gas chamber,with a fuel scattering clearance of a size large enough for the liquidfuel to move therethrough and scatter in the combustion cylinder inatomized particles formed between the opening in the diffuser-vaporizerand the opening in the gas chamber to sustain combustion of the liquidfuel, a frusto-conical blast supply member extending through the gaschamber into the diffuser-vaporizer to supply a stream of air underpressure to the diffuser-vaporizer and then to the gas chamber a steamgenerating annular chamber provided at the end of a flame ejectingopening of the combustion cylinder for heating supplied water by theheat produced by combustion of the fuel in liquid state and generatingsuperheated steam therein, a hot blast producing annular chamberprovided outside said steam generating annular chamber, a steam lineconnected at one end to said steam generating annular chamber andopening at the other end in said frusto-conical blast supply member, anda hot blast duct connected at one end to said hot blast producingannular chamber and opening at the other end in said frusto-conicalblast supply member, said steam line opening at the other end in saidhot blast duct so that the superheated steam generated in said steamgenerating annular chamber is ejected into said hot blast producingannular chamber and mixed with the gasified fuel produced in saiddiffuser-vaporizer while being ejected through said combustion platewhereby combustion of the gasified fuel can be carried outsatisfactorily.

3. A gasified fuel burner adapted to convert a liquid fuel and waterinto a mixture of a gasified fuel and steam for combustion of the fuelin gasified state, comprising a combustion cylinder, a gas chamberdefined in said combustion cylinder and formed with an openingsubstantially in its central portion, a diffuservaporizer rotatablymounted in said-combustion cylinder and formed with an opening disposedin spaced juxtaposed relationship to said opening in said gas chamber,with a fuel scattering clearance of a size large enough for liquid fuelto move therethrough and scatter in the combustion cylinder in atomizedparticles formed between the opening in the diffuser-vaporizer and theopening in the gas chamber to sustain combustion of the liquid fuel, afrusto-conical blast supply member extending through the gas chamberinto the diffuser-vaporizer to supply a stream of air under pressure tothe diffuser-vaporizer and then to the gas chamber, a liquid fuel supplyline and a water supply line opening on the inner surface of thediffuser-vaporizer to supply the liquid fuel and water to thediffuservaporizer and cause the same to vaporize quickly, and acombustion passage provided at the periphery of the gas chamber andfluidly connected to said diffuservaporizer for ejecting at theperiphery of the gas chamber a mixture of gasified fuel and steamtogether with the stream of air supplied under pressure through theblast supply member whereby combustion of the gasified fuel can becarried out satisfactorily.

1. A gasified fuel burner adapted to convert a liquid fuel and waterinto a mixture of a gasified fuel and steam for combustion of the fuelin gasified state, comprising a combustion cylinder, a gas chamberdefined in said combustion cylinder and formed with an openingsubstantially in its central portion, a diffuservaporizer rotatablymounted in said combustion cylinder and formed with an opening disposedin spaced juxtaposed relationship to said opening in said gas chamber,with a fuel scattering clearance of a size large enough for the liquidfuel to move therethrough and scatter in the combustion cylinder inatomized particles formed between the opening in the diffuser-vaporizerand the opening in the gas chamber to sustain combustion of the liquidfuel, a frusto-conical blast supply member extending through the gaschamber into the diffuser-vaporizer to supply a stream of air underpressure to the diffuser-vaporizer and then to the gas chamber, a steamgenerating annular chamber provided at the end of a flame ejectingopening of the combustion cylinder for heating supplied water by theheat produced by combustion of the fuel in liquid state and generatingsuperheated steam therein, a steam line connected at one end to saidsteam generating annular chamber and opening at the other end in saidfrusto-conical blast supply member so that the superheated steamproduced in said steam generating annular chamber is mixed with thegasified fuel produced in said diffuser-vaporizer together with thestream of air supplied under pressure through the blast supply member,and a combustion plate provided at the periphery of the gas chamber forejecting therethrough a mixture of gasified fuel and superheated steamtogether with the stream of air supplied under pressure through theblast supply member whereby combustion of the gasified fuel can becarried out satisfactorily.
 2. A gasified fuel burner adapted to converta liquid fuel and water into a mixture of a gasified fuel and steam forcombustion of the fuel in gasified state, comprising a combustioncylinder, a gas chamber defined in said combustion cylinder and formedwith an opening substantially in its central portion, adiffuser-vaporizer rotatably mounted in said combustion cylinder andformed with an opening disposed in spaced juxtaposed relationship tosaid opening in said gas chamber, with a fuel scattering clearance of asize large enough for the liquid fuel to move therethrough and scatterin the combustion cylinder in atomized particles formed between theopening in the diffuser-vaporizer and the opening in the gas chamber tosustain combustion of the liquid fuel, a frusto-conical blast supplymember extending through the gas chamber into the diffuser-vaporizer tosupply a stream of air under pressure to the diffuser-vaporizer and thento the gas chamber a steam generating annular chamber provided at theend of a flame ejecting opening of the combustion cylinder for heatingsupplied water by the heat produced by combustion of the fuel in liquidstate and generating Superheated steam therein, a hot blast producingannular chamber provided outside said steam generating annular chamber,a steam line connected at one end to said steam generating annularchamber and opening at the other end in said frusto-conical blast supplymember, and a hot blast duct connected at one end to said hot blastproducing annular chamber and opening at the other end in saidfrusto-conical blast supply member, said steam line opening at the otherend in said hot blast duct so that the superheated steam generated insaid steam generating annular chamber is ejected into said hot blastproducing annular chamber and mixed with the gasified fuel produced insaid diffuser-vaporizer while being ejected through said combustionplate whereby combustion of the gasified fuel can be carried outsatisfactorily.
 3. A gasified fuel burner adapted to convert a liquidfuel and water into a mixture of a gasified fuel and steam forcombustion of the fuel in gasified state, comprising a combustioncylinder, a gas chamber defined in said combustion cylinder and formedwith an opening substantially in its central portion, adiffuser-vaporizer rotatably mounted in said combustion cylinder andformed with an opening disposed in spaced juxtaposed relationship tosaid opening in said gas chamber, with a fuel scattering clearance of asize large enough for liquid fuel to move therethrough and scatter inthe combustion cylinder in atomized particles formed between the openingin the diffuser-vaporizer and the opening in the gas chamber to sustaincombustion of the liquid fuel, a frusto-conical blast supply memberextending through the gas chamber into the diffuser-vaporizer to supplya stream of air under pressure to the diffuser-vaporizer and then to thegas chamber, a liquid fuel supply line and a water supply line openingon the inner surface of the diffuser-vaporizer to supply the liquid fueland water to the diffuser-vaporizer and cause the same to vaporizequickly, and a combustion passage provided at the periphery of the gaschamber and fluidly connected to said diffuser-vaporizer for ejecting atthe periphery of the gas chamber a mixture of gasified fuel and steamtogether with the stream of air supplied under pressure through theblast supply member whereby combustion of the gasified fuel can becarried out satisfactorily.